Translation of the abstract (English)

A review is given on the structural chemistry of Cu3PnQ3-compounds.
Cu3AsSe3 crystallizes monoclinic with a = 15.73 , b = 10.45, c = 6.761 Angström; beta = 92.93 ° (SG P21/m). The structure is build of isolated AsSe3 units and either trigonal or tetrahedral coordinated copper. A distinct feature of the structure is the fact, that to every fourth arsenic atom an an additional copper atom is ...

Translation of the abstract (English)

A review is given on the structural chemistry of Cu3PnQ3-compounds.
Cu3AsSe3 crystallizes monoclinic with a = 15.73 , b = 10.45, c = 6.761 Angström; beta = 92.93 ° (SG P21/m). The structure is build of isolated AsSe3 units and either trigonal or tetrahedral coordinated copper. A distinct feature of the structure is the fact, that to every fourth arsenic atom an an additional copper atom is located in a distance of 2.5 angstroem. Solid solution series through the replacement on th pnicogen or chalcogen sites shows the occurence of superstructures. These have the same structure detail, with copper coordinated to every third arsenic atom.
The low temperature modification of Cu3BiS3 crystallizes orthorhombic with a = 7.73 b= 10.300, c = 6.68 angstroem SG Pnm21. Its structure is almost the same as the room temperature structure.